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Phospholipids from bilayers because it is energetically favourable.

The hydrophobic parts don't like interacting with water molecules, so they interact with each other instead. The hydrophylic parts like interacting with water, so they form the outside of the layers and shield the hydrophobic parts of the membrane.
Phospholipids from bilayers because it is energetically favourable.

The hydrophobic parts don't like interacting with water molecules, so they interact with each other instead. The hydrophylic parts like interacting with water, so they form the outside of the layers and shield the hydrophobic parts of the membrane.
A cell is surrounded by water. There is also a lot of water inside.

A phospholipid has two ends: one is "comfortable" in water; the other is not. The result is that any phospholipids, even in a glass of water, will bring their "water-avoiding" ends together, and leave the "water-liking" ends on the outside. In short, phospholipids in the presence of water form a bilayer.

This applies to all cell membranes, not only the plasma membrane (the outer membrane), but also the endoplasmic reticulum and all other membranes in the cell.

The end of the phospholipid molecule that is attracted to water is called the hydrophilic head, and its polar nature is due to its phosphate group. The two fatty acid chains form the hydrophobic end of the phospholipid. The whole molecule is termed amphipathic, meaning that it has both hydrophilic and hydrophobic components.

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